40 years Germany has been producing iron ore lepidolite from a tungsten-tin ore with magnetic separation and flotation. The mine only recovered tungsten and tin minerals in the 1920s, while iron-lithium mica was abandoned as tailings. Due to the market demand, the iron-lithium mica concentrate was recovered from the accumulated tailings by magnetic separation method, and then the iron-lithium mica beneficiation workshop was built. In 1945, the plant with a scale of 600 tons/day was built, respectively, using magnetic separation and magnetic separation. The iron-lithium mica concentrate is produced by combining two processes of flotation, and the concentrate grade is 95%-97% iron-lithium mica, and the recovery rate is 50%-70%. There are two types of ore processed, as shown in Table 1, and the production process is shown in Figures 1 and 2.
Table 1 Mineral composition of two ores
Quartz type | Mineral name | quartz | Lithium mica | fluorite | topaz | 锡石 | Black tungsten ore | |
content,% | 78 | 20 | 1.3 | 0.5 | 0.1 | 0.1 | ||
Yunying rock type | Mineral name | Yunyingyan, granite Feldspar, porphyry | quartz | Iron lithium mica | Black tungsten ore | 锡石 | other | |
content,% | 45 | 43 | 6 | 1 | 1 | 4 | ||
Figure 1 Old plant iron lithium mica beneficiation process
Figure 2 New plant iron lithium mica selection process
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